1221002102223 has 24 divisors (see below), whose sum is σ = 1768401765936. Its totient is φ = 811818144000.

The previous prime is 1221002102219. The next prime is 1221002102269. The reversal of 1221002102223 is 3222012001221.

It is not a de Polignac number, because 1221002102223 - 2² = 1221002102219 is a prime.

It is a super-2 number, since 2×1221002102223² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1221002102196 and 1221002102205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221402102223) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 21000613 + ... + 21058673.

It is an arithmetic number, because the mean of its divisors is an integer number (73683406914).

Almost surely, 2^{1221002102223} is an apocalyptic number.

1221002102223 is a deficient number, since it is larger than the sum of its proper divisors (547399663713).

1221002102223 is a wasteful number, since it uses less digits than its factorization.

1221002102223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64295 (or 64292 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 1221002102223 its reverse (3222012001221), we get a palindrome (4443014103444).

The spelling of 1221002102223 in words is "one trillion, two hundred twenty-one billion, two million, one hundred two thousand, two hundred twenty-three".